This book corresponds to the manual of practices for a simulator of teletraffic basic models. An important part in the studies of communication networks usually refers to the mathematical tools that help to dimension communication systems, which are known under the name of teletraffic and are based on the queueing theory and stochastic processes. The simulator of teletraffic models is a useful tool to understand these systems because it allows to control step by step its way of operating thanks to a windows environment, and to get output parameters from input parameters which have been previously fixed by the user. The simulator is implemented by means of a Java applet that can be freely executed from: In addition, the manual includes an appendix containing the basic theory of teletraffic.